Join Date: Jun 2004
Location: West Michigan
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Easy way is toplace slight upwards pressure on the area to open up the cracks, then clean them out well with acetone etc, Then using thinned gel coat, or thinned paint, fill the cracks up. With paint, do it in several applications as each 'coat' will shrink a bit.
when they're full ease off on the pressure, but don't completely remove it (scissor type car jack works well for that purpose) so they close back up. when it sets up, bond and then glass a plywood backer under the area to spread the load.
I normally use paint because it's more flexible than gel coat and seems to last longer.
I've done those repairs several times with both materials, but have only ever had the cracks come back with gel coat