Michigan Fiberglass
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Boat hull scratches

For scratches in gelcoat up to 1/32 of an inch deep - Try sanding them out first with a hard rubber block using 320 grit water sand paper followed by 800 and 1000.
Wash block, sand paper and job between grits.
Don't stay in one spot too long during sanding to avoid a dip, work the area as well. Keep a close eye to make sure you don't sand through.

Polishing - Michigan Fiberglass Recommends:

Polish gelcoat with Tuff-Stuff ® Rapid Cut Compound for first polish followed by GlossMaster Polish for a brilliant shine using an adjustable polisher with speeds up to 2400 rpms. Be sure to use a white wool polish pad for first cut then a finer yellow wool pad for final GlossMaster to finish. Be sure to wash off the Tuff-Stuff before applying the GlossMaster with the yellow pad, avoiding grit contamination.

Finish with a final coat of Diamond Luster Wax.

Aqua-Buff® Tuff-Stuff® Rapid Cut Compound

Aqua-Buff® GlossMaster® Polish

If sanding gelcoat scratches on true colors as red, blue, green etc. sand a small area first in a discreet area to be sure there is not a big change in color due to fading.
Do not remove dry compound with polisher, running a dry pad will create wheel marks.
Deep Scratches

Simply roughing up the inside of a scratch and filling it with a gelcoat paste then a sand and polish will be quite visible around the edge of the scratch and will shrink during polishing, the same goes for chips and air voids. A gelcoat patch kit may be a quick fix but may be very noticeable on your boat hull.

If you are looking for a professional boat repair, a fill and spray is the technique needed to achieve that as shown in this fiberglass and gelcoat repair video.

Scratches in true color red, blue, green, black and so on are tough even for the professional and usually have to be matched and sprayed to a large area to blend using clear gelcoat for a blender. Gelcoat patch kits are a very noticeable fix on true colors.

Some outfits match polyurethane paints like Imron for spot repair because it is easier to match and blend, the problem is the paint will eventually peel around the edges and eventually all the paint will peel off, avoid painting directly over gelcoat.

Any paint products and clears will flake off maybe sooner than later if gelcoat is not primed first. Gelcoat will stick to gelcoat best for spot repairs.

Michigan Fiberglass can blend any color Gelcoat.

Send us a chip of the Gelcoat and our lab will match it.

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